mongodb connection added, logs added, gitignore changed

prototype/coordinator/config.json

@@ -0,0 +1,6 @@
+{
+    "ip" : "127.0.0.1",
+    "port" : "3001",
+    "mongodb_url" : "mongodb://127.0.0.1:27017/",
+    "database_name" : "pixel_streaming"
+}

prototype/coordinator/coordinator.js

@@ -0,0 +1,108 @@
+// http
+const http = require('http')
+// filesystem
+const fs = require('fs')
+// server config
+var config = require('./config.json');
+// node date time
+var node_time = require('node-datetime')
+
+// write startup server history
+var logs_dir = './logs'
+if (!fs.existsSync(logs_dir))
+    fs.mkdirSync(logs_dir)
+
+fs.appendFileSync(`./${logs_dir}/launch_history.log`, (node_time.create().format('Y-m-d H:M:S')).toString() + '\n')
+
+
+// mongodb connect function
+async function connect_mongodb(MongoClient)
+{
+    const mongodb_client = new MongoClient(config.mongodb_url)
+    try 
+    {
+        // connect to the MongoDB cluster (now just database)
+        await mongodb_client.connect()
+
+        // connect to database
+        const database = mongodb_client.db(config.database_name)
+        console.log('Database connection status:', await database.command({ping: 1}))
+
+        // get titles collection
+        var title = database.collection("title")
+        console.log(`Titles count: ${await title.countDocuments()}`)
+        title.insertOne({title:{en:"Title", ru:"Название"}, 
+            location:{en:"Russia, Moscow", ru:"Россия, Москва"}, 
+            description:{en:"Best RC ...", ru:"Лучший ЖК ..."},
+            image:{main:"URL1", second:"URL2"}
+        })
+    }
+    catch(e)
+    {
+        console.error(e)
+    }
+    // finally
+    // {
+    //     await mongodb_client.close()
+    //     console.log("Database connection closed")
+    // }
+}
+
+// response function
+function create_response(request)
+{
+    var request_json = JSON.parse(request)
+    switch(request_json.verb)
+    {
+        case 'GET_TITLES':
+            break;
+        case 'PLAN_SESSION':
+            break;
+        case 'CREATE_SESSION':
+            break;
+        case 'CONNECT_SESSION':
+            break;
+        case 'CONNECT_SESSION_WITH_CODE':
+            break;
+        default:
+    }
+    return '{"verb":"WAIT"}'
+}
+
+
+
+
+// connect to mongodb
+const {MongoClient} = require('mongodb')
+connect_mongodb(MongoClient).catch(console.error)
+
+// start http server
+const server = http.createServer(function(request, response)
+{
+    var message = ''
+    if (request.method == 'POST')
+    {
+        var body = ''
+        request.on('data', function(data)
+        {
+            body += data
+        })
+
+        request.on('end', function()
+        {
+            response.writeHead(200, {'Content-Type': 'message'})
+            response.end(create_response(body))
+            console.log(body)
+        })
+    }
+    else
+    {
+        message = 'UNDEFINED_REQUEST' + ': ' + request.method.toString()
+        response.writeHead(200, {'Content-Type': 'message'})
+        response.end(message)
+        console.log(message)
+    }
+})
+
+server.listen(config.port, config.ip)
+console.log(`Listening at http://${config.ip}:${config.port}`)

prototype/coordinator/package.json

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+{
+  "name": "coordinator",
+  "version": "1.0.0",
+  "description": "",
+  "main": "coordinator.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "type": "commonjs",
+  "dependencies": {
+    "express": "^4.18.2",
+    "mongodb": "^4.12.0",
+    "node-datetime": "^2.1.2"
+  }
+}